diff -r 054dfee29bfc -r f719caf263de web/controller.py
--- a/web/controller.py	Thu Mar 12 19:43:44 2009 +0100
+++ b/web/controller.py	Thu Mar 12 19:44:05 2009 +0100
@@ -22,7 +22,7 @@
                          ('__redirectpath', '__redirectpath'),
                          ('__redirectparams', '__redirectparams'),
                          )
-NAV_FORM_PARAMETERS = [fp for ap, fp in NAVIGATION_PARAMETERS]
+NAV_FORM_PARAMETERS = tuple(fp for ap, fp in NAVIGATION_PARAMETERS)
 
 def redirect_params(form):
     """transform redirection parameters into navigation parameters